Alstom SHPM 101, Service Manual

Page: 179 / 336

SERVICE MANUAL R5888C
QUADRAMHO Chapter 2
Appendix A
Page 43 of 71
Elapsed time
Input
55 55 56 55 54
'Data in' is
measured
length of 1/2-
cycle in units
of 179 ms
Synchronism checked
every 4th edge and
adjusted
±
bit
55 55 56 55 54 55 55
55 56
55
55
Rotation
anticlockwise
Output
56 55 55
1/2 cycle generated
using 'data out'
DA
TA
OUT
Rotation
reversed
Output
56 55 55
1/2 cycle generated using
'data out'
55 55 56 55
54 55
55
55
13
39
25
41
DA
TA
OUT
DA
TA
IN
Figure 45: Synchronous polarising faulty line conditions
Figure 44: Synchronous polarising healthy live line conditions